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9 May, 12:38

Which epression is equivalent to (4+7i) (3+4i) ?

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  1. 9 May, 14:16
    0
    Using FOIL ...

    (4+7i) (3+4i) = 12+16i+21i+28i² = 12+37i+28i²

    Because i²=-1 ...

    12+37i+28i² = 12+37i+28 (-1) = 12+37i-28 = - 16+37i
  2. 9 May, 16:33
    0
    (12+12i)
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